 /*******************************************************************************
  * Copyright (c) 2006, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  ******************************************************************************/

 package org.eclipse.core.databinding.observable.map;

 import org.eclipse.core.databinding.observable.IObservablesListener;
 import org.eclipse.core.databinding.observable.ObservableEvent;

 /**
  * Map change event describing an incremental change of an
  * {@link IObservableMap} object.
  *
  * @since 1.0
  *
  */
 public class MapChangeEvent extends ObservableEvent {

     /**
      *
      */
     private static final long serialVersionUID = -8092347212410548463L;
     static final Object TYPE = new Object ();

     /**
      * Description of the change to the source observable map. Listeners must
      * not change this field.
      */
     public MapDiff diff;

     /**
      * Creates a new map change event
      *
      * @param source
      * the source observable map
      * @param diff
      * the map change
      */
     public MapChangeEvent(IObservableMap source, MapDiff diff) {
         super(source);
         this.diff = diff;
     }

     /**
      * Returns the observable map from which this event originated.
      *
      * @return the observable map from which this event originated
      */
     public IObservableMap getObservableMap() {
         return (IObservableMap) getSource();
     }

     protected void dispatch(IObservablesListener listener) {
         ((IMapChangeListener) listener).handleMapChange(this);
     }

     protected Object getListenerType() {
         return TYPE;
     }

 }

